[PATCH RESEND v5 3/5] ARM: rockchip: add sram dt nodes and documentation
From: heiko@sntech.de (Heiko Stübner)
Date: 2013-10-22 15:27:35
Also in:
linux-devicetree, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
The Rockchip SoCs need a special part of their sram for bringup of additional cores. Therefore also limit the public area when adding the mmio-sram node to keep the sram driver from using this space. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Ulrich Prinz <redacted> --- .../devicetree/bindings/arm/rockchip/smp-sram.txt | 24 ++++++++++++++++++++ arch/arm/boot/dts/rk3066a.dtsi | 6 +++++ arch/arm/boot/dts/rk3188.dtsi | 6 +++++ 3 files changed, 36 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt
diff --git a/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt b/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt
new file mode 100644
index 0000000..0c88d06
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt@@ -0,0 +1,24 @@ +Rockchip SRAM for smp bringup: +------------------------------ + +Rockchip's smp-capable SoCs use the first part of the sram for the bringup +of the cores. Once the core gets powered up it executes the code that is +residing at the very beginning of the sram. + +Therefore the available space has to be limited to exclude this area using +the available property of the sram node. + +Required node properties: +- compatible : should contain both "rockchip,rk3066-sram", "mmio-sram" + so that the smp code can select the correct sram node. + +The rest of the properties should follow the generic mmio-sram discription +found in ../../misc/sram.txt + +Example: + + sram: sram at 10080000 { + compatible = "rockchip,rk3066-sram", "mmio-sram"; + reg = <0x10080000 0x10000>; + available = <0x50 0xffb0>; + };
diff --git a/arch/arm/boot/dts/rk3066a.dtsi b/arch/arm/boot/dts/rk3066a.dtsi
index 2218c64..e91048b 100644
--- a/arch/arm/boot/dts/rk3066a.dtsi
+++ b/arch/arm/boot/dts/rk3066a.dtsi@@ -64,6 +64,12 @@ clock-names = "timer", "pclk"; }; + sram: sram at 10080000 { + compatible = "rockchip,rk3066-sram", "mmio-sram"; + reg = <0x10080000 0x10000>; + available = <0x50 0xffb0>; + }; + pinctrl at 20008000 { compatible = "rockchip,rk3066a-pinctrl"; reg = <0x20008000 0x150>;
diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index 1a26b03..a9885df 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi@@ -60,6 +60,12 @@ interrupts = <GIC_PPI 13 0xf04>; }; + sram: sram at 10080000 { + compatible = "rockchip,rk3066-sram", "mmio-sram"; + reg = <0x10080000 0x8000>; + available = <0x50 0x7fb0>; + }; + pinctrl at 20008000 { compatible = "rockchip,rk3188-pinctrl"; reg = <0x20008000 0xa0>,
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1.7.10.4